Method for determining optimum recording condition and optical recording/reproducing apparatus using the same

Abstract

A method for determining an optimum recording condition of an optical recording / reproducing apparatus is used for recording data into an optical disc. Data is first written into a plurality of test regions of the optical disc under a plurality of recording conditions, respectively. The data written into the plurality of test regions are converted into radio-frequency (RF) signals. The RF signals are Viterbi-decoded to obtain corresponding path metric increase rates. The path metric increase rates are used to determine an optimum recording condition.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for determining an optimum recording condition of an optical recording / reproducing apparatus for recording data in an optical disc, and more particularly to a method for determining the optimum recording condition according to the recorded quality of data. The present invention also relates to an optical recording / reproducing apparatus capable of detecting quality of recorded data and determining an optimum recording condition according to the quality of recorded data. BACKGROUND OF THE INVENTION [0002] Referring to FIG. 1, an optical head 1 of an optical recording / reproducing apparatus is schematically shown. A laser beam emitted from a semiconductor laser module 11 is focused on a disc 2 via lenses 14 and 15, and the light reflected by the disc 2 is transmitted to a photo-detector 12 to realize information from the disc 2. In general, data are written into the disc 2 by modifying the recording material of the ...

AI Technical Summary

Benefits of technology

[0008] The present invention also provides a method for determining a recording condition for recording a disc by an optical recording / reproducing apparatus by means of observing the quality of the RF signals, thereby achieving optimum recording performance.

[0014] In another aspect, the present invention provides a method for determining recording quality of an optical recording / reproducing apparatus. In the method, a first RF signal and a second RF signal are read from the optical disc. The first RF signal and the second RF signal are Viterbi-decoded to obtain a first path metric increase rate and a second path metric increase rate, respectively. The first path metric increase rate and the second path metric increase rate are compared to determine one of the first and second RF signals resulting in a smaller path metric increase rate to be better in recording quality.

Problems solved by technology

The laser power beyond the operable range would result in inferior data read-back performance or even read-back failure.

The β value, however, cannot perfectly reflect the quality of the RF signal since it just indicates the symmetric degree of the RF signal.

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